Improvement in sewing-machines



2 SheetsSheet 2 A. W. SANGSTER. SEWING MACHINE.

No. 19,535. Patented Mar. 2, 1858.

W%% Invent W i or.

UNITED STATES PATENT OFFICE.

AMOS W. SANGSTER, OF BUFFALO, NEW YORK,-ASSIGNOR TO VICTOR M. RICE, JAS. SANGSTER, AND ELIZA REMINGTON, 0F SAME PLACE IMPROVEMENT IN SEWING-MACHINES.

Spl-elliration forming part of Letters Patent No. 19,535, dated Man-h2. 1858.

To all whom it 31mg concera:

Be it known that I, AMos \V. SANGSTER, of

Buffalo, in Erie county, and State ofNew York,

have invented certain new and useful Improvements'in Sewing-Machines; and I declare the following description of my method of constructing the same to be snfiiciently clear and exact to enable others skilled in the art to make and use my invention, and for that purpose reference is had to the accompanying drawings.

Fi ure 1 in said drawin s is a )OIS )ective view of the machine, showing the construction and operation of the feeding machinery, and also the manner of governing the tensionor strain of the ,thread; Fig. 2 is a side eleva tion of the looper when in a position to hold the loop open, so that the needle may pass through it. Fig. 3 shows the position of the loopcr when it is in the act of passing into (or through) the loop. Fig. 4 represents the positionof the looper just before it passes into the loop. Fig. 5 is a part of the bed-plate U, showing the two apertures-one .for the .nee dlc and one for the looper.

The same letters of'referencc 1n the several figures represent similar parts in each.

In Fig. l, B is the main shaft. 0 is a crank, (and wheels, which, when'turned, gives the upand-do'wn or vibrating motion to the needle bar. A is the spool, containing the thread, which moves upon a rod placed upon the frame-work Z. E is a spring which regulates the strain or tension of the thread. F is a setserew for the purpose of increasing or diminishin'g the PIQSSHPB of the spring E upon the thread. XVhen sewing, the thread is drawn between the spring Eand the piece E. D is' a set-screw which fastens the needle-bar in the vibrating plate I). Sis abar whicht-erminates in an elastic foot-pieee which presses upon the cloth or fabric to be sewed. H is a stationary bar or plate, which is fastened firmly-to the frame Z. I is a sliding bar, which passes through the ends I I of the stationary plate H. K is a bar which is jointed at the point L to the sliding bar 1 and jointed or hinged) at the point M to a bar which is fastened by a movable joint to the stationary plate I-P at the point I. P is the feedingwheels. They are fastened together by means of a permanent axle (or rod) which passes through the centers of each and forms or termia nat-es in pivots on their outer sides. This double wheel moves or revolves in the frame R. The holes in the said frame R are made in the form of a slot, as shown at the point Q, in which the ends of the axle of said double 'wheel works, and receives two -n1'otions.one a vibrating horizontal motion, the'second arevolving motion. "The horizontal motion is produced only when the wheel iswadvancin'g in a proper direct-ion to carry thecloth forward. The wheel at thesame time remains stationary on its center or axis. The revolving motion is g-iven'tothe wheel only at' the time it movesbackward to renew its hold up onthe cloth. R isv a frame-piece which in its forward motion prevents the double wheel P from revolving by means of its front edge,

which is sharp and catches into the teeth or.

notches on the outer edge of said. wheel. In its backward movement itrecedes from said wheel and allows it to roll or revolve. The frame R is fastened to the bar 0. This bar 0. is attached tothe piece N, and can belowered or raised' (up or 'down,') 'the piece N, by means of the set-screw or cranl': T on said bar N, and'a slot in the piece 0,; thus adapting or adjusting the wheel P to any thickness'of Ina terial. The bar N is firmly attached to the.

movable frame I. The'feed or forward motion is given to the material to be sewed as follows: XV hen the needle-bar ascends, the stationary nut (on the lower end'of the needle; bar) E" presses upwardagainst the jointed frame-work at the point M,- thus throwing the joint M in (or nearly in) a straight line with the joints L and I. This, of course, throws the point L of the movable frame-work out ward from the needle-bar, also carries with it the bar I and the set-screw.- G, which is attached to the said bar I, alsothe bars N and O, and frame-piece It. The frame-piece R is inadeinthe form of a sharp knife-edge on the inner side, and as it advances forward its edge catches into the notches in the double wheel 1 and carriessaid double wheel forward horizontally, (without allowing it to re; vo1vc,)-and the eloth with it, far enough to measure the length of a 'stitch.- .The down ward motion of the needle barcarries the frame R back again, (either by an attachment of a spring on the'needlefbar or on the sta"- tionary frame Z,) and draws the sharp edge of the frame It out of the notches in. the double wheel, thusallowing said wheel to 'roll back.- ward (instead of rubbing over the cloth) far enonghto take another stitch forward. The

length of the stitch is regulated by the setserew G, which butts against the piece M when the machine is operating.

In Fig. 2, W is the looper. Y is a guard which keeps the looper close to the guide-plate V. O is a square bar, which is attached to the plate V. X is an elastic spring, which holds the point of the looper' close against the bar 0. G is a plunger which works up and down in a groove on the plate V. D is a case or tube which holds the plunger 0 in its place on the plate V. D andD are two project ing pins on the lower part of the plunger 0.

K. is a pin projecting upward from the plate V. This pin v catches or forces the point of the looper out from the needle when the plun ger is forced down, as will be readily seen by reference to Fig. 4. The spring X is attached to the lower part of the plunger. Thelooper is forced-upward against the bed-plate U by the spring B, which presses against. the pin- D". A is a stay which holds saidspring in its place. The point of the looper presses into.

the hole in the bed-plate at Z. There are two apertures in the bed-plate U, which are shown in Fig. 5. The point of the looper works into the plate U and assumes the position of Fig. '2,

when the loop is drawn up and spread, as shown iii-Fig: 2, ready for the needle to' pass through it and form another stitch or loop.

I do not claim imparting a feeding or forward motion to the cloth or (other material) while being sewed by meanh of a wheel wh ch moves the cloth while revolving, as that has been done before; but Y lVhat I claim as my invention, and desire to secure by Letters Iatent, is f h p I The specific mechanism herein described, consisting of the frame-work, slide, and toggle-joint, designated by the letters H, 1 ,1, I,

L, K, M, M, N, O, and R, arranged and op-,

erating in the manner and for the purpose specified.-

AMOS w. SANGSTER.

Witnesses:

FoRnUsH, JAMES SANGSTER. 

